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Journal of Dental Research
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Biomaterials & Bioengineering

Impact of Curing Protocol on Conversion and Shrinkage Stress

H. Lu1, J.W. Stansbury1,2 and C.N. Bowman1,2,*

1 Department of Chemical & Biological Engineering, Engineering Center, ECCH 111, University of Colorado at Boulder, Boulder, CO 80309-0424, USA; and
2 Department of Restorative Dentistry, University of Colorado Health Sciences Center, Denver, CO 80262, USA;

Correspondence: * corresponding author, Christopher.Bowman{at}colorado.edu

Since considerable shrinkage stress develops during the curing of dental composites, various soft-start photocuring protocols, aiming to lower stress but not compromise conversion, have been proposed. We hypothesized that utilizing soft-start photocuring will result in not only reduced stress, but also decreased conversion. We evaluated the impact of 3 protocols (soft-start, pulse, and standard) on the stress development and polymerization extent of an experimental composite. A novel set-up capable of simultaneous shrinkage stress, conversion, and temperature measurements on the same specimen was utilized. Analysis of the data shows that stress rises dramatically as a function of conversion in the vitrified state, and the utilization of soft-start or pulse curing results in specimens with reduced final conversion and shrinkage stress, compared with specimens cured according to the standard full-intensity protocol. Finally, this study demonstrates that the predominant reason for the reduced shrinkage stress attained with soft-start or pulse curing is a modest decrease in final conversion.

Key Words: shrinkage stress • conversion • curing protocol • dental composite

Journal of Dental Research, Vol. 84, No. 9, 822-826 (2005)
DOI: 10.1177/154405910508400908
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C.S. Pfeifer, J.L. Ferracane, R.L. Sakaguchi, and R.R. Braga
Factors Affecting Photopolymerization Stress in Dental Composites
Journal of Dental Research, November 1, 2008; 87(11): 1043 - 1047.
[Abstract] [Full Text] [PDF]